Die.



o. A. SMITH.

` DIE.

APPLICATION FILED FBB.5,191Z.

lPatented Marl 25, 1913.

2 SHEETS-SHEET l.

0. A.'S'MITH.

DIE.

APPLICATION FILED IEB-5, 1912.

2 SHEETS-SHEET 2.

SVI/UGM UNITED sTATEs PATENT OFFICE.

OSCAR A. SMITH, CLEVELAND, OHIO, ASSIGNOR TO THE-NATIONAL-ACMiE/MANU- FACTURING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

DIE.

Specication of Letters Patent.

Patented Mar. 25, 191.3.

To all wiz-m t may concern:

Be it known that I, Oscar A. SMITH,

a citizen of .the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new 7 and usefullmpnovements in Dies, of4 which in the use of which there will be no variationqff the thread during the operation -of the die, by reason of the fact that the construction is such that. it is impossible for thev v' die chasers to open while ing cut even though the. 20

he thread is bechaser operating means should be sliglbv shifted, and by means of which die the ad will be out the full length of the stica without mutilation of the lastthreadbeing cut or of 4an adjacent shoulder. I

A further object of the means, and in which the chasers' will be pro' vided with means which 'will prevent .the-

lifting thereof during the threading opera-' tion.

In the drawings accompanying and formf'.

ing lpart 'of thisl specification, Figure 1 'is a perspective view -of, the improved die.; Fig. 2 is a front end view thereof with the -front cap partly removed, a. part bf 'the structure being shown in section.; Fig. 3 is a. crosssectional view of the ldie shown yin Fig. 2, with the chasers 'in their closed or-threading position; Fig. 4 is a similar view to that shown in Fig. 3, but illustrating 4the Chaser operating cams in that position which permits the chasers to open; Fig. 5 is apart-ly sectional perspective view of the' front cap Fig. 6'is a perspective view of the die body,

certain details being shown in juxtaposition therewith; Fig. 7 is a vperspective view of the chaser operating cam member; Fig. 8"is` a perspective view ofthe main cap; Fig. 9 is a perspective View of the handle carrylng member with one of the detailsofthe mechf anism linjuxtaposition. thereto; Fig. 10v 1s al invention;4 is the. provision of an Vimprr'ived die 1n which the mea-ns for attaching'it to the turret; Fig.

perspective view of the spindle and the 11 is a perspective view of the die chaser I and its guiding means; Fig. 12 is a perspective view of the resetting handle and Fig.

13 illustrates the die in position-on the turret together with .the stop for limiting the forward movement of such turret. Figs. 5,

6 and 7 show the several parts in that posif.

tion which permits the proper assembling.;

thereof. Figs. 8, 9 and 10 also show the sesl eral parts in that position which permits tte proper assemblingof these parts.

Similar .characters of reference indicate corresponding partsthroughout the figures of the drawings. l

The threading tool, in the embodiment herein show n and described, comprises a die body l2 having a rearwardly extending 'shank portion 3 and which body is provided with a plurality, as four, guidesor ways 45, 6.

and-7 vextending, radially of the die body. The rear portions .of these ways are grooved or undercut, as at 8,.y (see Fig.4 6), to form recesses, In the ways 4, 5, 6,17 slide the die chasers, (see 11)., secured to guidev plates. or blocks 9 -projecting beyond the two side faces of the chasers into the recesses-8,

by which construction the chasers' are guided are maintained against -depthwise movement. Each of these plates is provided with. .projecting pins 10j in' position to engage` coiled springs 11 located in o enings 12 the die. body, lo ncat each si e of the die chasers.y These springs are 'effective to shift,

.vided with a locati-ng pin 10 adapted-to fit soI lin their opening and closing'movements and the chasers outwardly from the axis ofthe body. In practice each plate will be proin an opening 13.in the chaser. The outer I end' of each chaser is tapered circumferen- 'tially throughout the major portion thereof,

as at 14, and atthe rear, end thereof is also tapered depthwise of the tool, as at 15.

\ For closing the die chasers suitable means I' -is provided, herein designated as the die Chaser operating means or member, and consists of an axially bored disk 16 having forwardly extending projections or arms 17 preferably tapered on their forward ends, as at 18,whereby they will coperate more easily with the depthwise cam surfaces 15 ofthe chasers. vThe shank portion 3 of the die 4body extends through the boreof this roo 'major portion of the outer end oi' disk 16. Encircling this disk and its forw wardly extending arms is the die head cap or casing 19 centrally bored to receive the shank 3 oit' the diey body. Fitting over the 4front edge of this cap and secured to the die body is a front, axially bored cap 20.

IFor holding the die body, the chaser operating cam disk and the cap 19 in proper assembled position relatively one to another.,

thereby to permit proper movement of the Chaser cam disk relatively to the chasers.r` the die body is providedwith a pair of countersunk openings 21' the shoulders of which are'engaged by the heads of screws 22, which screws project 'through sleeves 23 entering such openings in the body, said v Chaser blocks are tapered. iii the direction ot sleeves having an enlarged head 24C ,in -position to engage the front Wall of the cam disk 16 and hold the same in engagement with the wall of the cap 19.' These screws 22 pass through the cani disk and are turned into threaded openings 25 ot the cap 19. rllhus the cliaser cam operating disk and cap are maintained in operative engagement for movement forward and backward.-

For adjusting the chasers toward and from 'the vwork suitable micrometer screw QGvis provided diagonallythrough the head cap, and this screvvis provided with a portion of less diameter, Vas 2T, for the reception of the bil'urcated end of a stud 28, (see Fig. 7), which stud is carried by the cam operating disk 16, so that on the adjustment 'of this screw it Will oscillate or rotate the disk 1G relatively to and independently of the head, provided the screws 22 irst suitably released, in one direction or the other according to the direct-ion in which the adji ing,r screw' is turned, so adjust the` chasers relatively to the work by reason of the tact that the forwardly projecting arms oi? the disk 16 are, as liereiiiloetore stated, in engagement with the circui'xiierentially pered portions of the chasers, this taper hef ing transverse to the airis oit' the tool'. The l L each cliaser is, however, formed as a straight sin :face in the direction off the axis of the tool or depthwise ot the cliasor. In other words, each chaser is not tapered' the direction ot the anis of the. tool except at its rear por tion, so that when the chasers are closed by the forward -movement of the head and the'` Chaser closing cam disk the arms of thelatter are ni ei'igaogenicnt with the. forward depthwise straight surfaces of the chasers,

and therefore no slight. shitting of the head or of the Chaser operating cam disk in a foi-ward or backward direction will permit any movement of the chasers, while. by oscillating or rotatingi` the disk 16 by means of the micrometer screw the chasers will be ad'jnstedin the mannerstated. Or, to put it. in other language, the outer 'ends of the chasers. are tapered transversely to the axis of the tool, by reason of which taper the chasers may be adjusted on rotating or (tiscillating the cani dislfa16 by means oi? its micrometer screw, but as the outer ton ward portions of these chasers-are straight depthwise throughout the v.major portion thereof follows thatjvhen the tool is at work no slight movement otlr'efdislr it? or of the cap carrying the sainekliorward or backward will peniit any movement ot' the chasers, since the arms` of the cani dish. `at this time have passed beyond or 'forward of the tapered surfaces 15 and are in on gagem'entwith the depthwise straight sur l faces or" the chasers.

In those dies where. the outer ends of the the axis of the tool, or dcpthvvise, with auch tapered portions in engagement with Jdie operating means therefor, it follows that. .any slight movement of the operating means backward or *forward would aectthe position of the chasers and result in a variation in the thread. being cut.. In the present iniproveineiit the chasers themselves are ta pered iii two directions, one transversely relatively to the axis 'of the tool and the other deptliwise or" the tool, but the latter 'tapered vsurface is at the rear ofthe chaser while the front portion thereof has a straight lat-e, so that when the chasers have been cone pletely closed the arms ot the operating; disk 16 have passed away from or are 'forward oi the deptiiwise tapered surfaces oi the chasers and consequently there is no opportunity for the chasers to shift from their proper position-s should the chascr oporab ing cams be moved backward or forward other than in the proper manner and by the means provided 'for that purpose. The elongated slot QS in the cap 19 permits the rotary or oscillatory movement ot the cani .f disk l@ by means of the micrometer screw.

Located on thc shank 3 is a disk or head 'ing in a slotted part thereof a L lever 30,'thc cud oi`- which projects into an opening Sil in the shank il, aud io this disY or head is scoured ay spindle or rod 32, it being shown screwed thereto by nierr of an enlarged hcad 3-3, and thiA spindle Hr v rod is provided with a smaller portion LL':

projecting into the bore ot the disk or herd QS) and into the shank 3, fittingloose@ therein. The spindle or rod constitutes the means for the attachment of the die to tlw turret (see Fig. 13), and therefore who so attached the disk or head $29 and this spindle are lined against movement exc( yit forward and backward with the turret. For flexibly connecting this disk or head :29 with the cap 19 of the die is a set of scri-.ws il@ turned into threaded openings 3T in the rear wall ot the cap 1), these screws being oit' smaller diameter than the shouldered openings 218 provided therefor in the disk or head 29. vEncircling a pair of these screws within the openings provided therefor in,

the disk or head 29 are springs 39, 'the inner ends of which` engage the shoulders of the openings just referred to in the disk or head 29. Thus, the die body, the caml operating disk and the cap 19 have .a'forward and backward movement relatively to the disk or head 29 in a manner which will be readily.'

understood, thus formingwhat may be con` sidered a floating die and permitting these parts to move forward to cut the last thread up against a shoulder, although the forward movement ofthe turretand the head 29 and its spindle'` orV rod has ceased.' In other words', when the turret is stopped at a predetermined point. by means of thestop 40,`

which is usually very 'close to-the finishing of the thread, the die can continue to cut the thread by reason of the fact that the chasers carried lby the die-body and such body, to-

- the cap, will move forward and *away from.

gether with the Chaser operating means and the fixed disk or hea'd 29, as shown` at 50, Fig. 13, the die thus opening at its rear in the manner shown in said Fig. 13 so as to permitthe chasers to follow the pitch of the thread. As this operation cont1nues,how ever, thesprings 39 between the fixed disk and the cap 19 gradually exert their force upon such, cap. and the cam disk and pull back the cam disk from the position showl in Fig. 3, where it holds the chasers in engagement with the work, tothe vpt )sitlon shown in Fig. 4, and so closes up the opening between the fixed disk and the cap 19,.

whereupon the springs located in the grooves of the die body lmmediately lopen the chasers and release --the work. In4 other words, the springs connecting the fixed disk with the cap are weaker than the pull of the chasers in cuttin the thread', so that the continued pull o the chasers endeavoring to follow the pitch of the thread opens the die at t-he back and therefore allows the cap4 19 and the cam disk to recede the length of the travely of the -cams on the' ends of the chasers and so permits such. chasers to be opened bytheirv springs. vThis .thus prevents the chasers y.from mutllating the work or the shoulder at the end of the thread. In other words, by reason of the construction v set forth, the entire die. head', comprising the chasers, the die body and the cam operating disk andy cap. 19, can .all move forward dur-` ing the cutting o fy the-.'threada predetermined distance and. away from the vfixed disk 29, sol thatat the proper time the springs, having been suiiicient-ly compressed, will vpull back the.cam disk and its cap 19, thisbeing permitted bythe opening or space- 50 hereinbefore referred to, and 'so allow the `chasers to be ope'nedl byl their springs ina manner which will be readily; understood,

whereupon, by shifting the' hand 'lever forward, the chasers will be reset by pulling the same backward into engagement with the arms of the cam'disk. l I

The 'foregoing construction allowsa slight universal movement of the die head carrylvn y the chasers, making it practically a iioating die, and so enables the die to form its own cent-er. vIn other words,.that part of the die' I structure *which has a vforward and'-backward movement independently of the fixed par-t of the die structure can have a slight oscillatory .or eccentric movement and t-h'us allow such movable; portion of the-die to have' a floating movement withrelationto the fixed head 29 and theiixed partcarried by the turret.,

. In 'practice it isinot absolutely essential that the springs between the fixed disk 29 and the cap- 19 be provided, as the screws connecting these parts at this pointmay be 'ofsuch length that while ythe movable'portion of the die structure may move forwardwith the die chasers yet the forward movement of\. the -cap 19 andthe cam -operating disk be limited by such screws, so that as the' cha-sers follow the thread .and the chaser operating disk is stopped in its forward-move-- ment the arms ofthe disk will disengage the outer ends of the chasers and the chasers be immediately, opened by theirl springs. g

By forming the' diev chasers with the cam faces directly on the'ends there'o'f, and" thus dispensing with the chaser blocks or holders usually.' provided, and. .by securing the chasers directly to the guide blocks or plates loof located' in the groovesof the diebody,'- sevleral. importanty advantages are obtained.

This hardened steel block-or plate secured to thechaser permits a more accurate positioning and travel of the chasers and affords` a muchbr'oader .surface for resistance,

so that as the chaser fits directly into t-he f l' dieblock itself and is' secured directlyto the plate therefor working in the recesses of the die body this -tendency is overcome.

I` claim as my. invention:

l1.-A threading die comprising a head consisting ofa. movable part and a 'fixed part, said movable part comprising a die body havingwvays, chasersjlocated in said ways and shiftable means supported in juxtaposition to the die body and shiftable axially of the die to effect' the normal openingand closing movement ofsaid chasers. and means connecting said 'movable' and fixed parts whereby during a part of the threading op ing a part of the threading operation the movable part of'the body may move away from the fixed part a predetermined distance sufficient to allow the chaser shifting ine-ans to disengage the chasers and permit the .opening thereof when pletely threaded. l

9. A threading die comprising a head consisting of a movable part and a fixed part, said movable part comprising a die body having ways, chasers located in said ways, springs for shifting the chasers outwardly and shiftable means. supported in. jutaposition to the body and shiftable axially ofthe die to effect the normal opening and closing movement of said chasers, and means including springs connecting said movable and fixed parts whereby during a part of the threading operation the movable part of the body may move away from the fixed part a predetermined distance sufficient to allow the chaser shifting means to disengage the chasers and permit the vopening thereof when' the work is com- `the work is completely threaded.

Vbody having ways, chasers ocated Vin said ways and each having a straight surface and a pair of cam surfaces onits out-er end, springs in said ways for moving the chasers outwardly and shif'table means supported in juxtaposition to the die body and having a part coperating with said chaser surfaces for shifting said chasers a'nd'comprising-a disk-shaped member anda cap inclosing the same, and means for holding said diskshaped menyfber and cap in engagement and in proper assembled position with the die body,-connecting devices including springs between the fixed part and movable part and effective to limit the forward movement of said chaser shifting means, and a handle carried by said fixed part and in engagement with the movable part for re-setting the chasers, the organization being such that during a part of the threading operation the movable part of the body may moveaway from` the fixed part a predetermined distance sufficient to allow the chaser shifting means to disengage the chasers and permit the opening thereof when the work is completely threaded.

11. A threading die comprising 'a head consisting of a movable part fixed part, said movable part comprising a' die body having wa ys provided with oppositely located recesses, chasers located in said ways and a plate secured -to said chasers and sliding in said recesses, shiftable means supported in juxtapositionto the die body and shiftable axially of the die to'effect the no rmal opening and closing movement of said chasers, and means connecting said movable the threading operation the movable part of the bodymaymove away from the fixed part a predetermined distance sufficient to allow the chaser-shifting means yto disengage the chasers and permit the opening thereof when the work is completely threaded.

12. A chaserfor av diel having a separable broad guide plate secured to the back throughout the major portion thereof and ext-ending beyond the sides ofthe chaser without surrounding any part of such sides.

, 13. A chaser for a'die having a separable broad guide plate secured to the back throughout the'v major portion thereof, and extending beyond the sides of the chaser with/ont surrounding any part of suchv sides, said guide plate and chaser having alocating pin. y

14. A threading *die having a die body having ways provided withoppositely lo- 'cated recesses, chasers fitting into the ways of the body, each of said chasers having a separable broad guide plate secured to the back thereof to project-beyond the sides into a pair of recesses and'without. surrounding any part of such chaser sides, whereby the chaser will be guided by its guide plate and Valso by the ways of the body.

15. A threading die comprising a fixed member and a movable body having chaser carrying means, chasers located therein, means connecting said body and fixed member whereby during a part of the threading operation the body may move away from the fixed member ai predetermined distance, and normally non-rotatable means supported 'in juxtapositionto the body and shiftable backwardly and forwardly axially of the die to veffect the normal opening and closing movement of ,the chasers, said 'chasers and means one having cam surface cooperating with the other.

16. A threading die comprising a fixed member and amovable body having chaser carrying means, chasers located therein, means connecting said body and fixed member whereby during a| part of the threading operation the body may move away 'from the fixed member a predetermined distance, and normally non-rotatable means supported in juxtaposition to the body and shiftable` backwardly and forwardlyaxially of the die 'i to effect the normal' opening and closing movement of lthe chasers,lsaid chasers and means one having cam surfaces coperatmg with the other, said cam surfaces extending in transverse directions. y

. 17. A threading die comprising a fixed member, a movable body having chaser supporting means, chasers carrled thereby, means connecting said' -fixed member and bodyto permit during a part of the threading operation a predetermined movement of the body away from the fixed member, and

normally vnon-rotatable means for shifting and holding; ille-'chasers in their threading Signed. at Cleveland, Ohio, this 30th day pusin and slfta'ble with 'the body' during of Jauary, 1912.

:x predetermnea part of its movement away f from thelxed member and normally shft- OSCAR A' {DMIH' able axially of the die away from the bedy Vlftnesses:

1in elle@ the release of the chasers at a pre- A. lV. HENN,

deermined time. PAUL E. RYAN, 

